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LM3421 Datasheet(PDF) 46 Page - Texas Instruments

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Part # LM3421
Description  N-Channel Controllers for Constant-Current LED Drivers
PDF  72 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3421 Datasheet(HTML) 46 Page - Texas Instruments

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:
=
=
k
13.6
-
-
0.62V
V
OFF
TURN
x R
1.24V
OV2
=
R
OV1
:
x
k
432
1.24V
- 0.62V
40V
2
9.94V
A
23
k
432
A
23
R
V
OV
HYSO
=
x
:
=
x
=
P
P
=
=
=
A
23
10V
R
OV2
P
:
k
435
V
HYSO
A
23 P
k:
30
1
R
2
UV
=
k:
18.2
R
1
UV =
R
UV1
(
)
R
R
1.24V
UV2
UV1 +
x
V
ON
TURN
=
-
=
V
10.1
=
(
)
k
130
k
18.2
1.24V
:
+
:
x
k
18.2 :
V
ON
TURN -
:
=
=
k
4
.
18
-
-
1.24V
V
ON
TURN
x R
1.24V
UV2
=
R
UV1
:
x
k
130
1.24V
-1.24V
10V
2.99V
A
23
k
130
A
23
R
V
2
UV
HYS
=
x
:
=
x
=
P
P
=
=
=
A
23
3V
R
UV2
P
:
k
130
V
HYS
A
23 P
D1 o 12A, 100V, DPAK
mW
600
mV
600
A
1
V
I
P
FD
D
D
=
x
=
x
=
A
1
I
I
LED
MAX
D
=
=
-
LM3421, LM3421-Q1, LM3423, LM3423-Q1
SNVS574F – JULY 2008 – REVISED JULY 2015
www.ti.com
Typical Applications (continued)
(136)
A 100-V diode is chosen with a current rating of 12 A and VDF = 600 mV. Determine PD:
(137)
The chosen component from step 10 is:
(138)
8.2.2.2.11
Input UVLO
Solve for RUV2:
(139)
The closest standard resistor is 130 k
Ω; therefore, VHYS is:
(140)
Solve for RUV1:
(141)
The closest standard resistor is 18.2 k
Ω, making VTURN-ON:
(142)
The chosen components from step 11 are:
(143)
8.2.2.2.12
Output OVLO
Solve for ROV2:
(144)
The closest standard resistor is 432 k
Ω; therefore, VHYSO is:
(145)
Solve for ROV1:
(146)
The closest standard resistor is 13.7 k
Ω, making VTURN-OFF:
46
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Copyright © 2008–2015, Texas Instruments Incorporated
Product Folder Links: LM3421 LM3421-Q1 LM3423 LM3423-Q1



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